Marie Antoinette and Louis are about to make their first official visit to Paris. But when the King becomes seriously ill, the succession suddenly becomes a reality.

Louis may now be King, but Marie Antoinette is determined to launch her reign as the Queen of France. However, as her political advice is ignored and Provence and Joséphine threaten to deliver an heir, a chill sets in the royals' marriage.

Antoinette's brother Joseph comes to Versailles to save the marriage, but realizes he will have his work cut out in uniting this estranged couple, still childless after seven years. Time is running out to save the Franco-Austrian alliance.